<h3>Navigation</h3>
<ul>
  <li><a href="{{ pathto(master_doc) }}">概览</a>
    {% if parents or prev or next %}<ul>{% for parent in parents %}
      <li><a href="{{ parent.link|e }}">{{ parent.title }}</a>
        {% if not loop.last or (prev or next) %}<ul>{% endif %}{% endfor %}
          {% if prev %}<li>Previous: <a href="{{ prev.link|e }}" title="{{ _('previous chapter') }}">{{ prev.title }}</a>{% endif %}
          {% if next %}<li>Next: <a href="{{ next.link|e }}" title="{{ _('next chapter') }}">{{ next.title }}</a>{% endif %}
        {%- for parent in parents %}</ul>
      </li>{% endfor %}
    </ul>{% endif %}
  </li>
</ul>
